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defnyddiwyd pyrethroidau synthetig yn eu lle ac maent ganwaith yn fwy niweidiol i fywyd afon nag organoffosffadau
synthetic pyrethroids have been used in their place and they are a hundred times more damaging to river life than organophosphates
mae llawer iawn o waith i'w wneu ; rhaid addysgu pobl ac mae cydweithrediad rhwng asiantaethau ac asiantaeth yr amgylchedd ac undebau'r amaethwyr a'r ffermwyr yn hanfodol i sicrhau y caiff pyrethroidau synthetig eu gwaredu mewn modd cywir
there is a great deal of work to be don ; people must be educated and co-operation between agencies and the environment agency and the farming unions and the farmers is essential to ensure that synthetic pyrethroids are disposed of in a correct manner